Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
“Most mathematics books are filled with finished theorems and polished proofs, and to a surprising extent they ignore the methods used to create mathematics. It is as if you merely walked through a picture gallery and never told how to mix paints, how to compose pictures, or all the other "tricks of the trade."”
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
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Richard Hamming 90
American mathematician and information theorist 1915–1998Related quotes

Discussion to ‘Statistics in agricultural research’ by J.Wishart, Journal of the Royal Statistical Society, Supplement, 1, 26-61, 1934.
1930s
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 495
Tommy Lee Wallace on Crafting His Miniseries Masterpiece, IT https://dailydead.com/stephen-king-week-tommy-lee-wallace-on-crafting-his-miniseries-masterpiece-it/ (October 27, 2015)

Les Loix du Mouvement et du Repos, déduites d'un Principe Métaphysique (1746)

Attributed to George Boole in: Des MacHale (1993) Comic sections: the book of mathematical jokes, humour, and wisdom. p, 107
Attributed from posthumous publications
Source: Die Mathematik die Fackelträgerin einer neuen Zeit (Stuttgart, 1889), p. 94.